The invention relates to a multi-plane cooker having one or more heat energy sources for cookers with at least one at least one upper heat energy source located at a greater height than said lower heat energy sources. The process involves reacting ethanol over a suitable catalyst in a reactive distillation column. Configurations of the switches change in frame synchronization at the start of a synchronized data frame. Another embodiment of the interface member includes a bone cage comprising a cage bottom and removable cage top to hold a bone block at one end of a bone-tendon-bone graft. Conversely, when the difference between the discharge pressure and the suction pressure is great, the communicating path is made discontinuous by the differential pressure regulating valve whereby the intermediate gap is placed at an intermediate pressure lower than the discharge pressure. A channel may be disposed within the wall.